Blue-gray Gnatcatcher

Gobemoucheron gris-bleu · Polioptila caerulea · Family Polioptilidae
Density map of Blue-gray Gnatcatcher
Density map of Blue-gray Gnatcatcher (average density, males/ha) Show detections

Land cover associations

Density (males/ha) across Canada and in Bird Conservation Regions within Canada (see Methods)
Density by lancover for Blue-gray Gnatcatcher

Population size

Population size (million males) is based on summing up predictive maps by regions (intervals in parentheses reflect the 5th and 95th percentile of the bootstrap distribution; see Methods)
RegionAbundance
(M males)		Density
(males/ha)		Area
(M km2)
Canada0.0327
(0.0235 — 0.0449)		0.0001
(0 — 0.0001)		6.21
4 Northwestern Interior Forest0
(0 — 0)		0
(0 — 0)		0.546
5 Northern Pacific Rainforest0
(0 — 0)		0
(0 — 0)		0.136
6 Boreal Taiga Plains0
(0 — 0.0002)		0
(0 — 0)		1.18
7 Taiga Shield & Hudson Plains0
(0 — 0)		0
(0 — 0)		1.49
8 Boreal Softwood Shield0.0024
(0.0008 — 0.0052)		0
(0 — 0)		1.32
9 Great Basin0
(0 — 0)		0
(0 — 0)		0.0552
10 Northern Rockies0
(0 — 0)		0
(0 — 0)		0.372
11 Prairie Potholes0.0001
(0 — 0.0003)		0
(0 — 0)		0.444
12 Boreal Hardwood Transition0.018
(0.0108 — 0.0278)		0.0005
(0.0003 — 0.0007)		0.373
13 Lower Great Lakes/St. Lawrence Plain0.0088
(0.0064 — 0.0117)		0.0009
(0.0006 — 0.0012)		0.102
14 Atlantic Northern Forest0.0011
(0.0005 — 0.0058)		0.0001
(0 — 0.0003)		0.195
6-0 Boreal Taiga Plains, South0
(0 — 0.0002)		0
(0 — 0)		0.756
6-1 Boreal Taiga Plains, North0
(0 — 0)		0
(0 — 0)		0.428
7-0 Taiga Shield & Hudson Plains, West0
(0 — 0)		0
(0 — 0)		0.561
7-1 Taiga Shield & Hudson Plains, East0
(0 — 0)		0
(0 — 0)		0.925
8-0 Boreal Softwood Shield, West0.0001
(0 — 0.0002)		0
(0 — 0)		0.348
8-1 Boreal Softwood Shield, Ontario0.0014
(0.0004 — 0.003)		0
(0 — 0.0001)		0.395
8-2 Boreal Softwood Shield, East0.001
(0.0003 — 0.0021)		0
(0 — 0)		0.473
8-3 Boreal Softwood Shield, Newfoundland0
(0 — 0)		0
(0 — 0)		0.0945

Data accessibility

  • Download average density raster layers in GeoTIFF format.
  • Download results in Excel (xlsx) format. Sheets contain abundance and density estimates and also the list of species, variables, variable importance and validation metrics.
  • Access the population size and density estimates via the JSON API.

Citing these results

Boreal Avian Modelling Project, 2020. BAM Generalized National Models Documentation, Version 4.0. Available at https://borealbirds.github.io/. DOI: 10.5281/zenodo.4018335. [Results for Blue-gray Gnatcatcher (Polioptila caerulea)]